Improvement in devices



A. PIGKETT.

Devices for Swaging Saw-Teeth.

N0. 134,395} Patented Dec 31,1872.

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AARON PIOKETT, OF ANDOVEE, OHIO.

H MPROVEMENT IN DEVlCESl-"OR SWAGING SAW-TEETH.

Specification forming part of Letters Patent No. 13%,395, dated December31, 1872.

To an whom it may concern:

Be known that I, AARON PIOKETT, of Andover, county of Ashtabula andState of Ohio, have invented an Improvement in Swages for spreading orgrooving and spreading the under or forward edge of a saw-tooth, ofwhich the following is a specification:

The object of the invention is to spread or to make a groove or hollowand spread the under or forward edge of a saw-tooth, the cutting-edge asdistinct from the point; and the nature of the invention is in combininga slotted tooth-holder with a die-punch so as to hold the tooth firmlywhile the die is driven against the under or forward or cutting face oredge as distinct from the point of a saw-tooth.

The following description and accompanyin g drawing with their lettersof reference will fully illustrate the invention.

A represents a punch, in and with which are held and combined all theparts of the swage. a represents a mortise through the broad toothend ofthe punch A to receive and hold a toothholder and die-holder. 12represents a long,

round, smooth handle-end of the punch A,

whereby to hold and drive the swage. 0 represents a diagonal slot in theedge and end of the broad part of the punch A, in a plane at a rightangle to the plane of the mortise a to go over the edge of a saw andallow a sawtooth to enter a tooth-holder within the mortise. Brepresents a tooth-holder adapted to fit and go within the mortise a ofthe punch A. d represents a slot in the tooth-holder B to go over andhold a saw-tooth, and which slot is in the same plane and becomes partof the punch-slot 0 when the tooth-holder is within the mortise 6b ofthe punch A. 6 represents a hole or recess in one lip of thetooth-holder B, through from the outside to the slot d, to allow a dieto enter to a point opposite the slot. O

represents a die-holder adapted to fit and go within the mortise a ofthe punch A beside the tooth-holder B; f represents a step or recess inthe die-holder O, in the side next the tooth-holder B, to receive andhold a die. 9 represents a lug at each end of the die-holder 0, wherebya die-mover may seize and move it along. D represents a die adapted tofit and go within the recess f of the die-holder O. h represents theworking end or point of the die D, adapted to spread or indent andspread the edge of a saw-tooth. E represents a diemover, forked at oneend, and adapted to be pivoted to opposite sides of the broad end of thepunch A to embrace the punch and to seize and move the die-holder anddie G D. t' represents a pivot on which the die-mover E is fastened tothe punch A. j represents a recess in the edge of each fork of thedie-mover E, shaped like a journal-bearing, to seize and hold each ofthe lugs g and move the dieholder 0 to and from in the mortise a of thepunch A, and to move the die D along the edge of the saw-tooth to beswaged. is represents a spring that may be, if desired, attached todie-mover E to steady the movement of the die D. F represents a swagedcommon sawtooth. 1 represents a hollow or groove in the under or forwardor cutting edge or face of a saw-tooth near the point, which hollow orgroove may extend to and from the point, and as far back as may bedesired. m represents an upsetting or spreading or widening of the underor forward or cuttting edge or face of a saw-tooth from the point backas far as desired.

To prepare the swage for work, pivot the die-mover E to the broad partof the punch A at the edge opposite to the slot 0,- put the dieholder Bwithin the mortise a of the punch, with slot d in the same plane andfacing the slot 0; put the die D within the die-holder O; and put thecombined die and die-holder within the mortise between, the die-holderand the slotted edge of the punch.

To work the swage, putthe slotted edge of the punch A over'the cuttingedge or face of a saw, with a tooth inserted in the slot of tooth-holderB, and with the under or forward or cutting edge or face of the toothnext to the combined die O D, and then drive on the end b of the punchwith a hammer, moving the die as the work is done by the die-mover E, asin Fig. 1. g

In swaging a saw-tooth to make a hollow or groove in the cutting-face,as described, it is better to begin with a small sharp-pointed die, andto finish with a large and blunt one. Therefore the die-punch must allowa ready and convenient change of dies; and this may be done by making aseries of dies, of which D may be one, and all adapted to fit the samedie-holder C; or the combined die-holder and die 0 D may be integrallyall in one piece, instead of in two pieces, as described, and have aseries of such combined dies, with the point h varied in each, asdesired. The combined die may be changed as readily as a die-point inthe die-holder.

An important feature of the invention is the ready movability of thecombined die 0 D along the face of the tooth to be swaged so as to workon an infinitesimal point at a time, as, in so hard a substance astempered steel, only in this way is it practicable large a surface asdesired.

There are several swages in the art for upsetting and spreading thepoints or angles, and thereby setting the teeth of a saw; but

I know of'no other for simply upsetting and spreading or grooving, orhollowin g'and s preadto swage so part of the tooth swaged AARONPIGKETT. Witnesses:

J. N. WIGHT, 1. A. WIGHT.

